Attachment plug with renewable fuse



Feb. 25, 1930.- J. A. GRIER ATTACHMENT FLUG WITH RENEWABLE FUSE FiledSept. 10. 1925 INVENTOR dafillmffi fiP/EJQ BY 7m. WEI/ W ATTORNEY?Patented Feb. 25, 1930 UNITED STATES JOHN ALFRED GRIER, OF NEW YORK, N.Y., ASSIGNOB' '10 D'UBILIER CONDENSER GOR- PORA'IION, OF NEW YORK, N.Y.,

A CORPORATION" OF DELAWARE ATTACHMENT PLUG WITH RENEWABLE FUSEApplication filed September 19, 1925. Serial No. 55,604.

This invention relates to improvements in plugs-commonly employed forattaching such implements as electric sad irons, electric cookingutensils, electric soldering irons, etc, to a light or power circuit.More particularly the invention .relates to such a plug havingincorporated therewith a replaceable member containing a fuse to protectthe attached electrical appliance from excessive current.

An object of my invention is to provide an attachment plug in which thefuse containing member can easily be replaced without the necessity ofemploying special tools.

Another object is to provide an attachment plug that is of strongconstruction and comprises relatively few parts which can be quickly andcheaply assembled-and commercially manufactured at a low cost.

A. further object of my invention is to provide an attachment plug thatwill not be damaged or catch fire when its self-contained fuse is burntout.

With these and other objects in view, as may later appear, my inventionconsists in certain structural features, which will be hereinafter fullydescribed, with the understanding that theseveral necessary elementscomprised in my invention may be varied in construction, proportion andarrangement of parts without departing from the spirit thereof, or thescope of the appended claims.

0n the drawings, in which the same reference numerals indicate the sameparts in the several views,

Figure 1. is a perspective view of my improved plug seen from one endand above Figure 2 is a similar view partly broken away on top to showthe internal arrange ment of the several parts.

Figure 3 is a cross sectional view along the line 3--3 of Figure 1.

Figure 4 is a top plan of part of said plug, with the cover removed.

Figure 5 is a perspective view of an ordinary fuse and casing for same.

Figure 6 is a top plan view partly in section of a modified form ofattachment plug in which the fuse containing casing is to be mounted, soas to not only provide a fuse, but also serve as a switching membermandFigure is a view of a detail, showing how the combined fuse member andswitch are mounted,

The numeral 1 indicates ail-oblong moulded housing, flattened on itsopposite iaces and formed of two portions 2, 3, in contact with eachother along the line i and secured together by retaining means or screws5. lThe halves 2 and 3 each have one end flattened and semi-circular incontour, so that when said halves are assembled with said ends adjacent,surface 6 results which is provided with two T shaped orifices 7 formedby recesses in the halves 2 and 8 and intended to receive the prongs ortongues of any standard supplemental connecting plug, or the prongscarried by the particular electrical appliance that is-to be connectedto the power circuit. in the construction of this housing any suitabieheat-resisting, high grade insulation that can be die-moulded may beused; for example some varieties oi bakelite either with or without afiller of ground mica, asbestos or the like. In plugs for some electricappliances, formed porcelain may advantageously be empioyed.

The half 2 of the moulded housing has certain grooves and recessestherein and the various conductive parts of my plug afiixed to it. Atthe extremity opposite the end 6,

the halves 2' and 3 have registering grooves enable the housing toreceive the cable 8, containing wires 9, 10..

The half 2 of the housing, adjacent the end at which the cable 8 enters,has a recess 11 in its surface which is overlaid by the cover 3, andthis recess communicates with a smaller recess 12 in the same surface,receiving a contact clip 13. This recess 12 is at one side of the half2, and adjacent the opposite side is a similar recess having therein asimilar clip. In the recess 11 is a contactl united to the wire 9 andthe first-mentioned clip 13; while the other clip 13 is connected to acontact strip or element 15, in the groove of the half 2 forming part ofthe adjacent ET-shaped recess 7, which is in line therewith. The otherwire 10 is connected to a similar bedded in the part 2,

contact 14 fixed in the recess 11. From this recess leads an embeddedconductor 16 in the same surface of the half 2 to the groove in saidsurface forming part of the other recess 7, which contains a similarcontact strip 15. Across the opposed cover 3 extend grooves whichregister to form a bore 17 to receive the envelope or casing 18,containing the fuse 19. This envelope is usually a small length of glasstubing, with end caps or closures 20, to which the fuse 19 is connected.This member com rising the fuse 19 can be slipped into the bore 17, sothat the caps 20 make contact with the two clips 13, thus connecting thewire 9 to the first-mentioned strip 15.

In practice, the member fuse is put into open end of the comprising thebore 17. When the ends of with the opposite sides of tacts or clips 13bridging the space between these clips, and the electrical appliance canbe used by connecting its terminals to the terminals or the member issimply pushed out of the bore 17, and a new one substituted. vcnientimplement, such as a nail, stick, etc, can be utilized, and noparticular tool is needed.

The under or inner face of the casing 18.

In the modification shown in Figures 6 and 7, the plug comprises aportion 2 and a cover 3, as before. But the clips 13 are omitted. Inplace of these clips, 2 carries a contact or brush 13, connected to oneof the wires or conductors 9 and placed opposite a similar contact orbrush 13 connected to one of the terminal strips 15 in one of theorifices 7. The brushes 13 and 13 may be placed about in the middle ofthe portion 2. The other conductor or wire 10 is by a conductor 16 emtothe other strip 15 in the remaining orifice 7.

The cover 3 is made hollow and has a sufficiently large recess thereinto receive a carrier or disc or flattened cylinder, having a diametricore 22 passing therethrough from one side to the other and open at bothits ends, similar to the bore 17. This disc is provided with a journalor stem 23 which projects through the cover 2 and on the top of thiscover is a knob 24 aflixed to the stem 23.

knob carries an indication 25f fuse is slipped into the bore 22, and thecarrier 21 is turned to bring the bore 22 into line with the brushes 13and 13", 20 of the fuse member will the brushes 13 and 13", and fcourse, the diameter of the connect same. carrier 21 W11].

faces of the half 2 and th place by forcing it into eitherstrips 15. Ifthe fuse is blown the portion be about equal to the length of the fusemember, or a little less, so that when the knob 24 is operated to turnthe carrier to bring the fuse member into line with the brushes, one cap20 will make contact with one brush, and e other cap 20 with theremaining brush. Along with the indication 25, the words On and 011" maybe put upon the top of t e cover 2 to indicate the position of thecarrier 21 when it is holding the fuse member in position to bridge thebrushes 13 and 13, is turned to disconnect these rushes. Thus, the fusemember serves not only as a fuse, but also as a switch to open and closethe circuit.

The portions or halves 2 and 3 may be so shaped that the half 2 may alsobe recessed to some extent to receive part of the carrier 21 and thesides of the two halves 2 and 3 may have registerin recesses to form 0enings 17 which will e in line with the ore 22 when the knob 24 isturned to move the carrier, so as to disengage the fuse member from thecontacts 13 and 13".

Having described my invention, what I believe to be new and desire tosecure and protect by Letters Patent of the United tates is 1. Aconnecting plu comprising a pair of contacts, and a rotata le carrierbearing a fuse member, tobe moved into and out of engagement with saidcontacts, said fuse mem er being insertible into the carrier andremovable therefrom through the side of the plug.

2. A connecting lug comprising of contacts, a rotatable carrier betweensaid contacts, a fuse member in said carrier to be actuated into and outof engagement with said contacts, said member being insertible into thecarrier and removable therefrom through the side of the plug, and a knobon the exterior of the plug to actuate said carr191.

Intestimony whereof I afiix my si ature.

JOHN ALFRED Gl l ER.

